I don't know much about the Lower Wolf around Fremont...but if it's anything like the Upper Wolf...you're going to see lots of rocks and fast changes in depth.
Speaking honestly...the only boats I would use would be a canoe or a jon.
There's a paved launch just north of Fremont in Mukwa...just south of south of New London. Here's the DNR page about it...http://dnrmaps.wisconsin.gov/imf/ex...strID=2228
Chances are you will have to Copy & Paste that link...as we've been having a difficult time with links on here
You might also consider giving the area DNR office a call...and try to find someone with knowledge of the area
Here's general bag limits for fish...but you may want to take a look in the regulations...as many areas have special limits.
Here's a page for various .pdf files of this year's regs...
ALL the pdf's are the same on that page (d'oh!)
see page 70 of it for "Winnebago System Waters"
I did a Google Image Search for "Wolf River" + "Fremont, WI"....here's the results.
This campground is up near that Mukwa launch I mentioned...
Good luck...& enjoy your trip